I will be very happy if this works. The lowest I can set my charge voltage to is 26.8 volts. But still the inverter always stops charging at 27.07 volts and then floats. That's a little less than 3.4 volts per cell. I have no way to change any other settings.
What is your bulk/absorb voltage?
What is your charge termination criteria?
Do you have a float stage?
If yes what is the float voltage?
I am not convinced holding cells at 3.4 volts over an extended period of time will reduce the capacity of a cell and plan to test this.
If you are correct then you should set bulk/absorb and float as high as your top balance will allow.
Personally I think that holding cells at >3.4 volts per is abuse.
Remember I have a UPS I ordered from China and other than some quirks I really like it.
I can't guarantee that I will.
I've recently made my own online 7kwh UPS.
I use a Powermax converter/charger as my charge source.
Its charges at 29.0 volts for ~30 minutes(which is really meaningless as the battery will never get to constant voltage in that time frame)
The it charges at 27.2 volts for ~12 hours and usually doesn't make it to saturation.
Then it switches to 25.9 volts at which point the battery takes the full load.
At 11:30pm the outlet timer disconnects the charger for 30 minutes and the cycle repeats itself.